Trillion promise consulting the hotline: W18Cr4V tungsten high-speed steel, high hardness, red hardness and high temperature hardness. The wide range of quenching heat treatment difficult to overheating, heat treatment process is not easy oxidation and decarbonization, better grinding performance. This steel at 500 ° C and 600 ℃ hardness were maintained at HRC57 ~ 58, and HRC52 to 53, for a large number of, the general material to be worked having a good cutting. The Contents Introduction 1W18Cr4v, used a tungsten high-speed steel, it belongs ledeburite most lasting kind of high-speed steel. And other high-speed steel, often referred to as "white steel", the "Feng Steel" or the "wind of steel" (air-cooled to quenching). Vanadium content of the chemical composition (GB / T 9943-2008 "high-speed tool steel"): the carbon content of 0.7 - 0.8%, containing 17.5 - 19% of the amount of tungsten, chromium content of 3.80 - 4.4%, with 1.0 - 1.4%, the silicon content is less than 0.4%, the manganese content is less than 0.4%, the molybdenum content is less than 0.3%. The 3 red hardness: cutting temperature 540 degrees, the hardness can keep the HRC66 cutting temperature of 600 degrees, the hardness can keep HRC63 4 advantages: versatility, process maturity. 5 Disadvantages: severe carbide segregation, thermoplastic meet special hardware can not be processing and special tough material, tool hardness and red hardness. The content of alloying elements, and high cost. 6 Cutting speed: 80 m / sec (600 degrees Celsius). 7 uses: the complex shape of the small tool. Nature and processing W18Cr4V of 8 W18Cr4V steel composition of the steel characteristics in the steel, carbon and chromium, tungsten, molybdenum, and vanadium (carbide forming elements) and the like form a carbide, in order to improve hardness, abrasion resistance and red hardness. Tungsten is to improve the the red hardness major elements, the formation of carbides in the steel. When heated, part of the carbides into austenite, and contains large amounts of tungsten and other alloying elements, the stability of the high tempering of martensite formed after quenching. During tempering, the portion of the tungsten carbide in the form of diffuse precipitation, resulting in secondary hardening. Undissolved carbides play a role to prevent the austenite grain heating. Vanadium can significantly improve the red hardness of high speed steel, hardness and wear resistance. Vanadium carbide formed during heating, and some into austenite, fine particle dispersion precipitated during tempering, causing a secondary hardening and improve the steel red rigid. Chromium in high-speed steel is mainly to increase its hardenability, while improving anti-oxidation and decarbonization of steel and the corrosion resistance. Cobalt can significantly improve the red hardness and hardness of the steel. The organizational structure W18Cr4V W18Cr4V steel cast structure was bone-shaped, the carbide flaky and martensite or troostite alternating ledeburite, as well as black organizations (δ segregation) and white tissue (martensite and retained austenite). Especially uneven cast microstructure and chemical composition of high-speed steel and heat treatment does not alter the pressure processing must therefore be broken coarse eutectic carbides and evenly distributed, then use to create a variety of cutting tools and the the mold "Five Strong Metal" W18Cr4V high-speed steel forging process heating is prone to over-firing, it is prone to chipping close to the forging of this temperature range, the heating temperature should be strictly controlled. 1). Forging temperature range W18Cr4V belongs to high alloy steel, which is characterized by slow warming, the forging temperature range is narrow. The initial forging temperature of 1100 ~ 1150 ° C, the final forging temperature of 900 to 950 ° C. 2). The heating time determination W18Cr4V steel has poor thermal conductivity, which normally takes the segmented heater. The low temperature section of the heating temperature is 800 ~ 900 ° C, the heating time is generally calculated by 1mi n / mm. High temperature rapid heating, the heating time is generally 0. 5mi n / mm calculated. Heating, in order to prevent overheating or burnt to strictly control the maximum temperature. Furnace blank To replace the furnace right amount, but also kept flipping to the inside and outside temperature uniformity. Pre-treatment of the forging organizational W18Cr4V the heat treatment process heat treatment process is annealing temperature of 870 to 880 degrees, heat 2 to 3 hours, and then 800 a 840 degree preheated classification temperature of 580 to 620 from 1270 a 1280 degrees Martempering , then 560 degrees three times tempering, tempering is incubated for 1 hour. W18Cr4V containing large amounts of alloy elements: poor ductility, poor thermal conductivity, so that deformation of the of thermal stress cracking in the rapid heating, so to be heated to the quenching temperature of 1270 1280 degree preheated at 800 a 840 500 a 650 should increase once preheated, complex shape, V, W, and other major raise red hardness of elements from the dissolved high temperature, but too high temperature will, in turn, coarse grains, and W and other alloying elements are narrow Zone A, making the eutectoid the community to raise the temperature of the liquid crystal, and thus select 1270 1280 degrees. using Direct Air, the precipitation of secondary carbides, thereby reducing the red hardness of steel quenched organization M ten carbide ten residual A (up to 30%) 550 a 570 degree tempered precipitation WC, etc. caused by secondary hardening, A decomposition analysis of C, to reduce the content of alloying elements, the Ms rise, thus caused by secondary quenching time tempering, there is a 15% residual A, the second tempering residual A3% 5%, three times tempering, only 1% 2%, was tempered structure M final ten carbide ten very small amount of residual Beijing trillion promise Hotline: 010-84329660